[Elecraft] Remoting the KPA100 without a K102 in the K2

[Vic at VicsFloridaVilla.com]

Gangue,

Thanks for all the feedback on this.

As I currently have no plans to use computer control with my K2 (with or
without the KPA100) I think Sverre's method below looks like my solution. In
other words this method  is effectively  (and very simply)  providing an
extended connector to the P4 in the K2 to the KPA 100 .

Have I got this right?

Has anyone actually done this?

Should I take any additional rf precautions?

Any suggestions greatly appreciated as I have no experience of this type of
circuitry.

Thanks all.

73,  Vic GW4JUN    K2 1926

ps  After three months of no progress on this build (too much WORK - ugh) I
am back on track . LPF coils went in last week. Rear panel  tomorrow.
_________________________________________________________________
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----- Original Message -----
From: "Sverre Holm" <svholm2 at broadpark.no>
To: "'vicsvilla'" <vicsvilla at inweb.co.uk>; <elecraft at mailman.qth.net>
Sent: Wednesday, December 08, 2004 11:08 AM
Subject: RE: [Elecraft] Remoting the KPA100 without a K102 in the K2


> > I am building a KPA100 and intend to remote this into a separate EC2
> enclosure along with
> > the KAT 100
> > My K2 does not have a K102 control board.
> > Can I do the remote installation using the K102 on the pa board ? The
> notes I downloaded
> > seemed to suggest that the k102 needs to be in the K2 .
>
> I looked at this also, as I am in the process of building a KPA100 which I
> intend to remote. I don't have the KIO2 in my K2.
>
> When the KPA100 is in a separate enclosure, the RS232 interface in the
> KPA100 will not work as it doesn't get the data in/out from the K2's
> processor. Instead the KIO2 does the translation to RS232. Therefore,
> without the KIO2, you can get the KPA100 to work remotely, but you will
not
> get an RS232 interface.
>
> If all you want is to get the KPA100 to work, you will have to do the
> following:
>
> - Install an RS232 connector in the K2/QRP lid
> - Connect GND to pin 5
> - Connect AUXBUS to pin 6 (KIO2 has 15 uH in series and 0.001 uF to GND)
> - Connect VRFDET to pin 7
> - Connect 12V to pin 8
> - Connect 8R to pin 9 (KIO2 has 3.9k in series)
>
> These connections shall be taken from connector P4 (Aux I/O) on the K2's
> control board. Alternatively, if the KAT2 is installed, all but 8R can be
> taken from it.
>
> I haven't tried this myself, but there shouldn't be too many uncertainties
> in this. However, the cost/effort of getting an KIO2, is not that much
> greater than doing the above, so I am still debating with myself whether
it
> is worth trying.